I had the same problem years ago in my shop in NJ. Spring humidity on the cool slab resulted in a wet floor and possibility of mold. I do have ceiling fans and that helped but to solve the problem, I built two of the "contraptions" shown in the picture.
Inside the box is a radon fan, mounted...
I had a similar problem - heated and insulated pole barn with concrete slab. My solution was two setups as shown in the picture, one at either end of the barn. On top of the box is an Aprilaire dehumidifier (not cheap to run so only on when required) which drains to the outside. Inside the box...
The key is to run multiple conduits - when you change your mind or upgrade, its easy to run a new cable.
As others recommended, I ran an Ethernet from my house to my garage. The fiddly part is putting the ends on the 8 tiny strand cable. There are tools to help with that and worth the investment.
This is my first Post after being on here a month or so - so I thought I would add something constructive.
I have one of those tools - there are several makes around - all similar and all probably made offshore.
I used it to insert the rivets into sheet metal , think car fender. I tried it on...